John H Tyson

US Patent:

6445496, Sep 3, 2002

Filed:

Oct 5, 2000

Appl. No.:

09/679930

Inventors:

Herman Melvin Presby - Highland Park NJ
John A. Tyson - Pottersville NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 1706

US Classification:

359366, 359152, 359188, 359195

Abstract:

A free-space wireless optical communication system is disclosed that utilizes a telescope design having aspherical mirrors, such as a Ritchey-Chretien (RC) telescope. RC telescopes are characterized by a concave primary mirror and a convex secondary mirror each having a hyperbolic shape. The disclosed mirror configuration provides a larger focal plane that allows for automatic alignment between a transmitter and receiver with a stationary or fixed mirror design, further contributing to a lower fabrication cost. Among other benefits, the larger focal plane permits an nÃn fiber array to be positioned in the focal plane of the RC optical telescope, thereby enabling point-to-multipoint communications with a single optical telescope. Each fiber in the nÃn fiber array of a transmitting telescope can be focused on a different receiving telescope in a wireless optical communication system. In this manner, each fiber in the nÃn fiber array sends optical energy over a distinct path to address a given receiving telescope.

US Patent:

6639710, Oct 28, 2003

Filed:

Sep 29, 2001

Appl. No.:

09/967216

Inventors:

Peter Kurczynski - Maplewood NJ
John Anthony Tyson - Pottersville NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ
Agere Systems Guardian Corp. - Orlando FL

International Classification:

G02B 2600

US Classification:

359290, 359291, 359214, 359224, 359230, 359292, 359295, 257239, 348775

Abstract:

An adaptive optics system is disclosed whereby at least one mirror in the system is manipulated using electrostatic force to selectively attract or repel a portion of the mirror to or from a particular electrode, respectively. This attraction or repulsion is accomplished by mechanically coupling a bound charge layer of dielectric material to at least one surface of the mirror and then placing a voltage across an electrode in an array of electrodes positioned near that mirror. The charge in the dielectric material combined with a suitable electric field makes it possible to attract portions of the mirror in one instant and then, by changing the sign on the voltage placed across the electrode, to repel those same portions in the next instant.

US Patent:

6643467, Nov 4, 2003

Filed:

Oct 5, 2000

Appl. No.:

09/680165

Inventors:

Herman Melvin Presby - Highland Park NJ
John A. Tyson - Pottersville NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 1000

US Classification:

398120, 398118, 398119, 385 31

Abstract:

A free space optical communication system is disclosed whereby the received power at the receive optical fiber is reduced by adjusting the transmitted light beam and/or the receive optical fiber with respect to each other when a specified power threshold is exceeded. This reduction in received power is achieved by either increasing the cross section of the transmitted beam relative to the receive telescope or, alternatively, moving the receive optical fiber and thereby enlarge the cross section of the received beam incident upon the receive optical fiber.

US Patent:

6657783, Dec 2, 2003

Filed:

Oct 5, 2000

Appl. No.:

09/680336

Inventors:

Herman Melvin Presby - Highland Park NJ
John A. Tyson - Pottersville NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 2300

US Classification:

359399, 359429, 398119, 398122, 398131

Abstract:

A free space optical communication system is disclosed whereby a transmit telescope and a receive telescope are aligned such that the point of maximum power of the received light beam is incident upon the optical fiber located at a specific point on the focal plane of the receive telescope. Such incidence is achieved by causing the transmitted beam to diverge by moving the transmit optical fiber to a point in front of the focal plane of the transmit telescope until at least a portion of the beam is incident upon the receive optical fiber. The transmit telescope and/or the receive telescope (or, alternatively, only the respective optical fibers of those telescopes) are then moved such that the point of maximum received power for that degree of divergence is incident upon the receive optical fiber. The transmit optical fiber, in response to received power measurements at the receive telescope, then incrementally moves back toward the focal plane of the transmit telescope thereby reducing the degree of divergence and achieving a greater signal per unit area at the receive telescope. As the divergence is reduced, the position of the either the transmit telescope and/or the receive telescope (or, respectively, the optical fibers) is incrementally adjusted to maximize the received power of the received signal which is incident upon the receive optical fiber for each degree of divergence.

US Patent:

6792185, Sep 14, 2004

Filed:

Feb 29, 2000

Appl. No.:

09/516268

Inventors:

Robert George Ahrens - Chatham NJ
Herman Melvin Presby - Highland Park NJ
Gerald E. Tourgee - Convent Station NJ
John Anthony Tyson - Pottersville NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 604

US Classification:

385115, 385 52, 356400

Abstract:

A method and apparatus are disclosed for aligning and maintaining the alignment of the transmitting unit and the receiving unit in an optical wireless communication system. The receiving unit includes an optical bundle positioned at the focal point of an objective optic element. The optical bundle is comprised of an array of optical fibers, arranged surrounding the receiving fiber. The receiving unit also includes a number of detectors that measure the optical signal strength on a corresponding fiber in the optical bundle. The array of fibers is used to detect the location of the received signal relative to the receiving optical fiber and to provide feedback to adjust the orientation of the optical bundle to optimize the received signal strength. When misalignment occurs between the received signal and the receiving fiber, some of the incident received signal will be captured by one or more of the outer optical fibers. The amplitude of each of the generated signals are then compared to each other, thereby giving a direction in which to drive the optical bundle back into alignment with the received signal.

US Patent:

7126742, Oct 24, 2006

Filed:

Dec 23, 2004

Appl. No.:

11/024373

Inventors:

Harold M. Dyson - Beith, GB
Peter Kurczynski - South Orange NJ, US
John A. Tyson - Winters CA, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ
University of California - Oakland CA

International Classification:

G02B 26/00
G02B 5/08

US Classification:

359295, 359846, 359847

Abstract:

A membrane receives an incident energy signal at a first surface of the membrane. An actuating electrode, located adjacent to the membrane on a side opposite the first surface, applies an actuating pressure to the membrane if an actuating potential is applied between the actuating electrode and the membrane. A restoring electrode, located adjacent to the first surface of the membrane, applies a restoring pressure to the membrane if a restoring potential is applied between the restoring electrode and the membrane. The restoring electrode has an outer surface defining an aperture that enables the incident energy signal to pass, for example, without significant obstruction and without significant attenuation, through the restoring electrode to impinge upon the membrane, and the length of the restoring electrode is at least as great as the smallest width of the aperture.

US Patent:

20030001073, Jan 2, 2003

Filed:

Jun 29, 2001

Appl. No.:

09/896805

Inventors:

Herman Presby - Highland Park NJ, US
John Tyson - Pottersville NJ, US

International Classification:

G01J001/20

US Classification:

250/201900

Abstract:

A free space optical communication system is disclosed whereby the optics of a receive telescope are manipulated using adaptive optics to compensate for wave front distortion of a light beam transmitted by a transmit telescope. Wave front distortion is manifested at the receive telescope as a deviation from the normal, orthogonal orientation of the wave front of the transmitted light beam relative to its line of travel. This deviation may be detected, for example, by a wave front sensor, such as a Shack-Hartman sensor, which identifies the slope, or beam tilt, of discrete sections of the transmitted beam. The optics of the receive telescope can then be deformed in such a way as to cancel the wave front distortion and correspondingly reduce the resulting distortion of the received signal.

US Patent:

20030034432, Feb 20, 2003

Filed:

Jun 29, 2001

Appl. No.:

09/896804

Inventors:

Herman Presby - Highland Park NJ, US
John Tyson - Pottersville NJ, US

International Classification:

G01J001/20

US Classification:

250/201900

Abstract:

A free space optical communication system is disclosed whereby the optics of a transmit telescope are manipulated using adaptive optics to precompensate for wave front distortion of a light beam transmitted by a transmit telescope. Wave front distortion is manifested at the receive telescope as a change in at least one characteristic of the image of the received signal such as, for example, a reduction in the amplitude of the received signal. A mirror of the transmit telescope is deformed in such a way as to reduce the wave front distortion and correspondingly increase the resulting amplitude of the received signal.